Pneumocystis carinii pneumonitis.
D001706:Biopsy; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005615:Freezing; D006801:Humans; D008168:Lung / Q000473:pathology; D011020:Pneumonia, Pneumocystis / Q000175:diagnosis* / Q000473:pathology; D013902:Radiography, Thoracic